<template>
    <div class="videodome">
      <div>
        <video
          id="videoCamera"
          width="250"
          height="250"
          autoplay
          style="border-radius: 180px; box-shadow: darkgrey 0 0 30px 5px"
        ></video>
      </div>
      <canvas
        style="display: none"
        id="canvasCamera"
        width="250"
        height="250"
      ></canvas>
    </div>
    <div class="img_bg_camera">
      <p style="color: #000000">图片显示</p>
      <img
        :src="imgSrc"
        alt=""
        class="tx_img"
        style="border-radius: 360px; box-shadow: darkgrey 0 0 30px 5px"
        v-if="imgif"
      />
    </div>
    <div class="bommen">
      <el-button type="success" @click="getCompetence()">打开摄像头</el-button>
      <el-button type="success" @click="setImage()">拍照</el-button>
      <el-button
        type="primary"
        @click="openFullScreen1"
        v-loading.fullscreen.lock="fullscreenLoading"
        >提交
      </el-button>
    </div>
  </template>
  
  <script>
  export default {
    data() {
      return {
        imgif: false,
        videoWidth: 250,
        videoHeight: 250,
        imgSrc: "",
        thisCancas: null,
        thisContext: null,
        thisVideo: null,
        imga: "",
      };
    },
    created(){
      // this.getCompetence()
    },
    methods: {
      getCompetence() {
        var _this = this;
        this.thisCancas = document.getElementById("canvasCamera");
        this.thisContext = this.thisCancas.getContext("2d");
        this.thisVideo = document.getElementById("videoCamera");
        // 旧版本浏览器可能根本不支持mediaDevices，我们首先设置一个空对象
        if (navigator.mediaDevices === undefined) {
          navigator.mediaDevices = {};
        }
        // 一些浏览器实现了部分mediaDevices，我们不能只分配一个对象
        // 使用getUserMedia，因为它会覆盖现有的属性。
        // 这里，如果缺少getUserMedia属性，就添加它。
        if (navigator.mediaDevices.getUserMedia === undefined) {
          navigator.mediaDevices.getUserMedia = function (constraints) {
            // 首先获取现存的getUserMedia(如果存在)
            var getUserMedia =
              navigator.webkitGetUserMedia ||
              navigator.mozGetUserMedia ||
              navigator.getUserMedia;
            // 有些浏览器不支持，会返回错误信息
            // 保持接口一致
            if (!getUserMedia) {
              return Promise.reject(
                new Error("getUserMedia is not implemented in this browser")
              );
            }
            // 否则，使用Promise将调用包装到旧的navigator.getUserMedia
            return new Promise(function (resolve, reject) {
              getUserMedia.call(navigator, constraints, resolve, reject);
            });
          };
        }
        var constraints = {
          audio: false,
          video: {
            width: this.videoWidth,
            height: this.videoHeight,
            transform: "scaleX(-1)",
          },
        };
        navigator.mediaDevices
          .getUserMedia(constraints)
          .then(function (stream) {
            // 旧的浏览器可能没有srcObject
            if ("srcObject" in _this.thisVideo) {
              _this.thisVideo.srcObject = stream;
            } else {
              // 避免在新的浏览器中使用它，因为它正在被弃用。
              _this.thisVideo.src = window.URL.createObjectURL(stream);
            }
            _this.thisVideo.onloadedmetadata = function (e) {
              _this.thisVideo.play();
            };
          })
          .catch((err) => {
            console.log(err);
          });
      },
      //  绘制图片（拍照功能）
  
      setImage() {
        this.imgif = true;
        var _this = this;
        // 点击，canvas画图
        _this.thisContext.drawImage(_this.thisVideo, 0, 0, 250, 250);
        console.log(_this.thisContext);
  
        // 获取图片base64链接
        var image = this.thisCancas.toDataURL("image/png");
        _this.imgSrc = image;
        window.sessionStorage.setItem("img", _this.imgSrc);
  
        console.log(this.imgSrc);
      },
      //关闭摄像头并上传数据
      openFullScreen1() {
        this.thisVideo.srcObject.getTracks()[0].stop(), //关闭摄像头
          setTimeout(() => {
            // var file = this.imga.substr(22)
            this.imga = window.sessionStorage.getItem("img");
            var file = this.imga;
            console.log(file);
            //base64数据放formData里面
            var formData = new FormData(); //*
            formData.append("multipartFile", file); //*
            formData.append("password", this.ruleForm.password); //*
            formData.append("username", this.ruleForm.name); //*
            //自己配置axios。
            // this.$http.post('url接口', formData).then(res => {
            // 	console.log(res);
  
            // })
          }, 2000);
      },
    },
  };
  </script>
  
  <style></style>
  